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I have a 75 gallon reef. mainly soft corals and polyps. I recenty went through a bad velvet break out and lost all my fish.. Lesson learned I have currently set up a hospital tank and plan on qt all new fish from here on out.. My Tank is going to sit fallow for at least 4 months

Ok question is .. I have noticed my zoanthids slowly closing and than die.. I have tried to look for a predator. I dont see anything. Can someone give me ideas on what might be happening. I have taken corals out of tank and dipped them trying to find a predator but dont see anything. water perimeters are good ..
Can marine Velvet affect corals?

Well, zoanthid eating nudibranchs and/or a Eunicid worm could be culprits. You should find the nudis on the zoas, but the Eunicid could be in a rock halfway across the tank, and only come out at night.